A DC attenuator allows common EEG equipment to record fullband EEG, and fits fullband EEG into standard European Data Format
| Autor: | Marco Roessen, Teunis van Beelen, B. Kemp, J. Gert van Dijk, Paul van Someren, Marion Stijl |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Offset (computer science)
Inverse filter Computer science Speech recognition EEG analysis Electroencephalography Syncope Fullband EEG Software Physiology (medical) medicine Humans EEG European Data Format Attenuator (electronics) medicine.diagnostic_test business.industry Brain Filter (signal processing) File format Electric Stimulation Sensory Systems DC EEG Europe Neurology Data Interpretation Statistical Neurology (clinical) EDF business Filtering Analysis DC bias |
| DOI: | 10.1016/j.clinph.2010.05.006 |
| Popis: | Objective Traditional electroencephalogram (EEG) recorders reject low frequencies and DC and therefore cannot handle fullband EEG. Dedicated fullband recorders use non-standard file formats, because the standard format (EDF) cannot handle large DC electrode offset voltages. Both facts limit the development and use of fullband EEG. We developed a modification that allows conventional equipment to record fullband EEG, and adapts both types of recorders to EDF. Methods The modification is a simple filter that attenuates the DC component and thus makes the EEG fit within traditional equipment limitations and EDF. The review software automatically ‘de-attenuates’ the DC component, without loss of information. Results DC attenuation by a factor of 10 made both types of recorders store DC attenuated fullband EEG into EDF files. Recordings were made during 0.5–24 h in 46 subjects. The DC de-attenuator automatically reconstructed the original fullband EEG within an amplitude range of ±100 mV and with a resolution of 0.3 μV. Using sintered Ag–AgCl electrodes attached with common procedures, reconstructed DC EEG in spontaneously moving subjects ranged between ±32 mV. Conclusions The modification works. Fullband recordings can now be analyzed by independent software, archived and exchanged. Significance Any EEG system can be made to record fullband EEG into standard EDF. |
| Databáze: | OpenAIRE |
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